Abstract
Sapogenin has been proposed to be the active component responsible for the beneficial effects of Jamaican bitter yam (Dioscorea polygonoides) in the management of diabetes. Most of the research activities on bitter yam have focused on the role sapogenin play in the management of diabetes. Changes in weight, activities of carbohydrate digestive and transport enzymes, alterations in the intestinal morphology, changes in blood lipids, reduction in lipid peroxidation and the prevention of liver damage associated with diabetes have all been attributed to bitter yam sapogenin supplementation. Also, the possible exploitation of bitter yam for nutraceutical/pharmaceutical purposes is based on the high saponin content. There are however, concerns about the beneficial claims of the findings especially with regard to the possible adverse effects that may accrue in the clinical applications. This review therefore provides an overview of the findings in this research area with a view to proposing the potential mechanisms whereby the supplement of bitter yam sapogenin extract exert its hypoglycemic and hypolipidemic properties and the probable adverse effects in diabetes mellitus.
This is a preview of subscription content, access via your institution.

References
Coursey DG (1967) Yams, an account of the nature, origins, cultivation and utilization of the useful members of Dioscoreaceae. Longman, London, p 230
McAnuff MA, Omoruyi FO, Sotelo-Lopez A, Asemota HN (2005) Proximate analyses and some anti-nutritional factor constituents in selected varieties of Jamaican yam (Dioscorea and Rajana spp). Plant Foods Hum Nutr 60(2):93–98 doi:10.1007/s11130-005-5105-0
McAnuff MA, Harding WW, Omoruyi FO, Jacobs H, Morrison EY, Asemota HN (2005) Hypoglycemic effects of steroidal sapogenins isolated from Jamaican bitter yam (Dioscorea polygonoides). Food Chem Toxicol 43(11):1667–1672 doi:10.1016/j.fct.2005.05.008
Dyer J, Wood S, Palejawa A, Ellis A, Shirazi-Beechey SP (2002) Expression of monosaccharide transporters in intestine of human diabetes. Am J Physiol Gastrointest Liver Physiol 282(2):G241–G248
McAnuff MA, Omoruyi FO, Gardner M, Asemota HN, Morrison EY (2003) Alterations in intestinal morphology of streptozotocin-induced diabetic rats fed Jamaican bitter yam (Dioscorea polygonoides) sapogenin extract. Nutr Res 23(11):1569–1577 doi:10.1016/S0271-5317(03)00163-5
Uchida K, Yakase H, Takeda K, Takeuchi N, Ishikawa Y (1984) Changes in biliary fecal bile acids in mice after treatments with diosgenin and b-sitosterol. J Lipid Res 25(3):236–245
Yoshikawa M, Xu F, Morikawa T, Ponpiriyadacha Y, Nakamura S, Asao Y, Kumahara S, Matsuda H (2007) Medicinal flowers. XII.(1) New Spiroststane-type steroid saponins with anti-diabetogenic activity from Borassus flabellifer. Chem Pharm Bull (Tokyo) 55(2):308–316 doi:10.1248/cpb.55.308
Ruales J, Nair BM (1994) Properties of starch and dietary fiber in raw and processed quinoa (Chenopodium quinoa Wild) seeds. Plant Foods Hum Nutr 45(3):223–246 doi:10.1007/BF01094092
McAnuff MA, Omoruyi FO, Asemota HN (2006) Intestinal disaccharidases and some renal enzymes in streptozotocin-induced diabetic rats fed sapogenin extract from bitter yam (Dioscorea polygonoides). Life Sci 78(22):2595–2600 doi:10.1016/j.lfs.2005.10.046
Tandon RK, Srivastava LM, Pandey SC (1975) Increased disaccharidase activity in human diabetics. Am J Clin Nutr 28(6):621–625
Oishi Y, Sakamoto T, Udagawa H, Taniguchi H, Kobayashi-Hattori K, Ozawa Y, Takasaki T (2007) Inhibition of increases in blood glucose and serum neutral fat by Momordica charantia saponin fraction. Biosci Biotechnol Biochem 71(3):735–740 doi:10.1271/bbb.60570
Jeon JR, Lee JS, Lee CH, Kim JY, Kim SD, Nam DH (2006) Effect of ethanol extract of dried Chinese yam (Dioscorea batatas) flour containing dioscin on gastrointestinal function in rat model. Arch Pharm Res 29(5):348–353
Cayen M, Dvornik D (1979) Effect of diosgenin on lipid metabolism in rats. J Lipid Res 20(2):162–174
Robins SJ, Fasulo JM (1997) High-density lipoproteins, but not other lipoproteins, provide a vehicle for sterol transport to bile. J Clin Invest 99(3):380–384 doi:10.1172/JCI119170
Morehouse LA, Bangerter FW, DeNinno MP, Inskeep PB, McCarthy PA, Pettini JL et al (1999) Comparison of synthetic saponin cholesterol absorption inhibitors in rabbits: evidence of non-stoichiometric, intestinal mechanism of action. J Lipid Res 40(3):464–474
Omoruyi FO, McAnuff-Harding MA, Asemota HN (2006) Faecal lipids and minerals in streptozotocin-induced diabetic rats fed Bitter yam (Dioscorea polygonoides) steroidal sapogenin extract. Pak J Pharm Sci 19(4):269–275
Bainton D, Miller NE, Bolton CH, Yarnell JW, Sweetnam PM, Baker IA, Elwood PC (1992) Plasma triglyceride and high density lipoprotein cholesterol as predictors of ischaemic heart disease in British men. The Caerphilly and Speedwell Collaborative Heart Disease Studies. Br Heart J 68(1):60–66 doi:10.1136/hrt.68.7.60
Wilson PW (1990) High-density lipoprotein, low-density lipoprotein and coronary heart disease. Am J Cardiol 66(6):7A–10A doi:10.1016/0002-9149(90)90562-F
McAnuff MA, Omoruyi FO, Asemota HN, Morrison EY (2002) Plasma and liver lipid distributions in streptozotocin-induced diabetic rats fed sapogenin extract from wild yam. Nutr Res 22(12):1427–1434 doi:10.1016/S0271-5317(02)00457-8
Aradhana, Rao AR, Kale RK (1992) Diosgenin—a growth stimulator of mammary gland in ovariectomized mouse. Ind J Exp Biol 30(5):367–370
Bell RC, Carlson JC, Storr KC, Herbert K, Sivak J (2000) High-fructose feeding of streptozotocin-diabetic rats is associated with increased cataract formation and increased oxidative stress in the kidney. Br J Nutr 84(4):575–582
Cho WC, Chung WS, Lee SKW, Leung AW, Cheng CH, Yue KK (2006) Ginsenoside Re of Panax ginseng possesses significant antioxidant and antihyperlipidemic efficacies in streptozotocin-induced diabetic rats. Eur J Pharmacol 550(1–3):173–179 doi:10.1016/j.ejphar.2006.08.056
McAnuff MA, Omoruyi FO, Morrison EY, Asemota HN (2003) Hepatic function enzymes and lipid peroxidation in streptozotocin-induced diabetic rats fed Bitter yam (D. polygonoides) steroidal sapogenin extract. Diabetol Croat 32(1):17–23
Kang M, Naito M, Tsujihara N, Osawa T (1998) Sesamolin inhibits lipid peroxidation in rat liver and kidney. J Nutr 128:1018–1022
Jeong TC, Kim HJ, Park JI, Ha CS, Park JD, Kim SI, Roh JK (1997) Protective effects of red ginseng saponins against carbon tetrachloride-induced hepatotoxocity in Sprague Dawley rats. Planta Med 63(2):136–140 doi:10.1055/s-2006-957630
McAnuff MA, Omoruyi FO, Morrison EY, Asemota HN (2005) Changes in some liver enzymes in Streptozotocin-induced diabetic rats fed sapogenin extract from bitter yam (Dioscorea polygonoides) or commercial diosgenin. West Indian Med J 54(2):97–101 doi:10.1590/S0043-31442005000200002
Sidhu GS, Oakenfull DG (1986) A mechanism for the hypocholesterolaemic activity of saponins. Br J Nutr 55(3):643–649 doi:10.1079/BJN19860070
Rothkopf M, Vogel G, Lang W, Lang E (1997) Animal experiments on the question of the renal toleration of the horse chestnut saponin aescin. Arzneimittenforshung 27:598–605
Liu SJ, Zhou SW (2000) Panax notoginseng saponins attenuated cisplatin-induced nephrotoxicity. Acta Pharmacol Sin 21(3):257–260
Diwan FH, Abdel-Hassan IA, Mohammed ST (2000) Effect of saponin on mortality and histopathological changes in mice. East Mediterr Health J 6(2–3):345–351
McKoy MG, Omoruyi FO, Asemota HN, Oswald RS (2004) Evaluation of toxicological effects of a sapogenin-rich yam (Dioscorea sp.) preparation with potential for treating hypercholesterolemia. FASEB 18(5):A999
Lehninger A (1982) Lehninger: principles of biochemistry. Worth, 444 Park Avenue South, New York
Hibasami H, Moteki H, Ishikawa K, Katsuzaki H, Imai K, Yoshioka K et al (2003) Protodioscin isolated from fenugreek (Trigonella foenumgraecum L.) induces cell death and morphological change indicative of apoptosis in leukemic cell line H-60, but not in gastric cancer cell line KATO III. Int J Mol Med 11(1):23–26
Leger DY, Liagre B, Corbiere C, Cook-Moreau J, Beneytout JL (2004) Diosgenin induces cell cycle arrest and apoptosis in HEL cells with increase in intracellular calcium level, activation of cPLA2 and COX-2 overexpression. Int J Oncol 25(3):555–562
Liargre B, Bertrand J, Leger DY, Beneytout JL (2005) Diosgenin, a plant steroid, induces apoptosis in COX-2 deficient K562 cells with activation of the p38 MAP Kinase signaling and inhibition of NF-kB binding. Int J Mol Med 16(6):1095–1101
Marzocco S, Piacente S, Pizza C, Oleszek W, Stochmal A, Pinto A et al (2004) Inhibition of inducible nitric oxide synthase expression by yuccaol C from Yucca schidigera roezl. Life Sci 75(12):1491–1501 doi:10.1016/j.lfs.2004.03.013
Wang Y, Zhang Y, Zhu Z, Zhu S, Li Y, Li M et al (2007) Exploration of the correlation between the structure, hemolytic activity, and cytotoxicity of steroid saponins. Bioorg Med Chem 15:2528–2532 doi:10.1016/j.bmc.2007.01.058
Santos WR, Bernardo RR, Pecanha LMT, Palatnik M, Parente JP, Sousa CBP (1997) Haemolytic activities of plant and adjuvants. Effect of Periandra mediterranea saponin on the humoral response to the FML antigen of Leishmania donovani. Vaccine 15(9):1024–1029 doi:10.1016/S0264-410X(96)00292-7
Tawab MA, Bahr U, Karas M, Wurglics M, Schubert-Zsilavecz M (2003) Degradation of ginenosides in humans after oral administration. Drug Metab Dispos 31(8):1065–1071 doi:10.1124/dmd.31.8.1065
Flaoyen A, Wilkins AL (1997) Metabolism of saponins from Narthecium ossifragum—a plant implicated in the aetiology of alveld, a hepatogenous photosensitization of sheep. Vet Res Commun 21:335–345 doi:10.1023/A:1005860220462
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Omoruyi, F.O. Jamaican Bitter Yam Sapogenin: Potential Mechanisms of Action in Diabetes. Plant Foods Hum Nutr 63, 135–140 (2008). https://doi.org/10.1007/s11130-008-0082-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11130-008-0082-z